Photoshop error in saving when working with Lightroom images

I have some images in lightroom that I selected to edit in Photoshop. I've done the photoshop edits and gone to save to then work further on it in Lightroom and it won't save the file at all. This is the error message I get: Could not save as “_MG_1513.psd” because write access was not granted.

The location where you are trying to save the file does not have permission for you to save a file there. Photoshop is getting a permissions error from the OS, and passing the information on to you so you can correct it.